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An adaptive pushover procedure based on effective modal mass combination rule

机译：基于有效模态质量组合规则的自适应推覆程序

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In order to overcome the major drawbacks of conventional pushover methods, researchers have recently been motivated to develop adaptive pushover procedures by which effect of higher modes as well as progressive damage accumulation are taken into account. In spite of their vigorous theory, these novel methods suffer from the quadratic modal combination rules, in which the sign reversals of load vectors in higher modes are neglected and consequently lead to a positive load pattern. In this paper, a displacement-based adaptive modal pushover method, called APAM, based on effective modal mass combination rule is developed in order to include the sign reversals in the load vectors. In this combination rule a modification factor associated to each mode of interest is determined and applied to the corresponding load vector. The modified modal load vectors are algebraically added and subtracted and result in a range of load pattern and thus, multiple pushover analysis is required. These load patterns are independently applied to the structure within an adaptive framework and the envelope of demand values is considered. These modification factors are updated proportional to the instantaneous dynamic characteristic of structure in each step. Another novel aspect of the proposed method is that the target displacement is estimated during the analysis by implementing the concept of capacity spectrum method recommended by ATC 40. In order to assess the accuracy of this method in predicting the seismic responses, the proposed methodology is applied to three different moment-frame buildings. The obtained results demonstrate that APAM procedure provides well estimation of important seismic demand parameters.
机译：为了克服常规推覆方法的主要缺点，最近激励研究人员开发自适应推覆程序，通过该程序考虑了较高模式的影响以及渐进式损伤累积。尽管它们具有蓬勃的理论，但是这些新颖的方法仍受二次模态组合规则的影响，在规则中，较高模式下的载荷矢量的符号反转被忽略，因此导致了正载荷模式。本文提出了一种基于有效模态质量组合规则的基于位移的自适应模态推覆方法，称为APAM，以将符号反转包括在载荷矢量中。在该组合规则中，确定与每种感兴趣模式相关的修改因子，并将其应用于相应的负载矢量。修改后的模态载荷向量通过代数方式相加和相减，从而导致一定范围的载荷模式，因此需要进行多次下推分析。这些负载模式独立地应用于自适应框架内的结构，并考虑了需求值的范围。这些修改因子在每个步骤中都与结构的瞬时动态特性成比例地更新。所提出方法的另一个新颖方面是，在分析过程中，通过实施ATC 40建议的容量谱方法的概念来估算目标位移。为了评估该方法在预测地震响应中的准确性，应用了所提出的方法到三个不同的时刻框架建筑物。所得结果表明，APAM程序可以很好地估计重要的地震需求参数。

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